Openwhyd - Collect and Share the tracks you love.
TIDAL - Tidal is a streaming music service supported by some of the most influential artists working in the industry.
SoundClick - SoundClick is a music-based social community.
Last.fm - The world's largest online music service. Listen online, find out more about your favourite artists, and get music recommendations, only at Last.fm
Music Smasher - Find any song. Music Smasher searches Spotify, Rdio, SoundCloud, Bandcamp, and YouTube.
Spotify - Map shows when two people play same song at same time